Holdawayite
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Formula:
Mn6(CO3)2(OH)7(Cl,OH)
System:
Monoclinic
Hardness:
3
Name:
For US petrologist, Michael Jon Holdaway (b. 1936).
This page provides mineralogical data about Holdawayite.
Classification of Holdawayite
Approved
Approval Year:
1986
5/C.06-20
5.BA.20
5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
A : With Cu, Co, Ni, Zn, Mg, Mn
5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
A : With Cu, Co, Ni, Zn, Mg, Mn
16b.4.2.2
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
4 : AmBn(XO3)pZqxH2O & with (m+n):p = 3:1
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
4 : AmBn(XO3)pZq
11.12.2
11 : Carbonates
12 : Carbonates of Mn
11 : Carbonates
12 : Carbonates of Mn
Physical Properties of Holdawayite
Hardness (Mohs):
3
Optical Data of Holdawayite
Type:
Biaxial (-)
RI values:
nα = 1.644 nβ = 1.719 nγ = 1.721
2V:
Measured: 12° to 18°, Calculated: 16°
Max Birefringence:
δ = 0.077
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
relatively strong
Chemical Properties of Holdawayite
Formula:
Mn6(CO3)2(OH)7(Cl,OH)
IMA Formula:
Mn62+(CO3)2(OH)7(Cl,OH)
Crystallography of Holdawayite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 23.437(5) Å, b = 3.3137(3) Å, c = 16.618(6) Å
β = 111.15(2)°
β = 111.15(2)°
Ratio:
a:b:c = 7.073 : 1 : 5.015
Unit Cell Volume:
V 1,203.67 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.93 | (100) |
| 7.77 | (40) |
| 5.459 | (80) |
| 3.879 | (70) |
| 2.926 | (40) |
| 2.690 | (60b) |
| 2.589 | (50b) |
Type Occurrence of Holdawayite
Relationship of Holdawayite to other Species
| 5.BA.05 | Azurite | Cu3(CO3)2(OH)2 |
| 5.BA.10 | Georgeite | Cu2(CO3)(OH)2 · 6H2O |
| 5.BA.10 | Glaukosphaerite | (Cu,Ni)2(CO3)(OH)2 |
| 5.BA.10 | Kolwezite | (Cu,Co)2(CO3)(OH)2 |
| 5.BA.10 | Malachite | Cu2(CO3)(OH)2 |
| 5.BA.10 | Mcguinnessite | (Mg,Cu)2(CO3)(OH)2 |
| 5.BA.10 | Nullaginite | Ni2(CO3)(OH)2 |
| 5.BA.10 | Pokrovskite | Mg2(CO3)(OH)2 |
| 5.BA.10 | Rosasite | (Cu,Zn)2(CO3)(OH)2 |
| 5.BA.10 | Zincrosasite | (Zn,Cu)2(CO3)(OH)2 |
| 5.BA.10 | Chukanovite | Fe22+(CO3)(OH)2 |
| 5.BA.15 | Aurichalcite | (Zn,Cu)5(CO3)2(OH)6 |
| 5.BA.15 | Hydrozincite | Zn5(CO3)2(OH)6 |
| 5.BA.25 | Defernite | Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x<0.5) |
| 5.BA.25 | UM1977-03-COSiO:CaClH | Ca10-11(CO3)7(SiO4)Cl1-2(OH)1-2 |
| 5.BA.30 | Loseyite | (Mn2+,Zn,Mg)4Zn3(CO3)2(OH)10 |
| 5.BA.30 | Sclarite | (Zn,Mg,Mn2+)4Zn3(CO3)2(OH)10 |
| 11.12.1 | Rhodochrosite | MnCO3 |
| 11.12.3 | Desautelsite | Mg6Mn23+(OH)16[CO3] · 4H2O |
| 11.12.4 | Kutnohorite | Ca(Mn,Mg,Fe)(CO3)2 |
Other Names for Holdawayite
Name in Other Languages:
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
References for Holdawayite
Reference List:
American Mineralogist: 37: 637-642.
American Mineralogist: 73: 632-643.
American Mineralogist: 73: 632-643.
Internet Links for Holdawayite
mindat.org URL:
https://www.mindat.org/min-1919.html
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Please feel free to link to this page.
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Localities for Holdawayite
This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality.
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(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Germany | |
| Wittern: "Mineralfundorte in Deutschland", 2001 |
| Der Aufschluss Vol.55, March/April 2004 |
Namibia (TL) | |
| American Mineralogist (1988): 73: 632-642. |
Romania | |
| http://minerals-of-the-carpathians.eu; Udubasa, G., Hartopanu, P., Ilinca, G. (1996). The Regionally metamorphosed Fe-Mn Ore Deposit at Razoare, Preluca Mts., Romania. Romanian Journal of Mineralogy, 77, 3-20. |
Kombat Mine, Kombat, Grootfontein District, Otjozondjupa Region, Namibia